Pyridinic-N-rich carbon dots in IFE-based Turn-off Fluorometric detection of nerve agent Mimic– Diethyl chlorophosphate and multicolor cell imaging

Mondal, Imran; Samanta, Dibyendu; Shaw, Manisha; Shaik, Md Abdus Salam; Mahto, Madhusudan Kr.; Basu, Rajarshi; Bhattacharya, Angana; Pathak, Amita

doi:10.1016/j.saa.2023.122530

Cited by 21 publications

(6 citation statements)

References 56 publications

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“…To improve the PET efficiency, we used NH 2 instead of OH to prepare a novel uorescent probe NZN because the amino group has strong electron-donating ability. 42 As can be observed from Fig. 2b and S2b, † NZN also displayed a strong uorescence band at 506 nm (F f = 42.7%).…”

Section: Rational Design and Modulation Of Uorescence Probes For Sen...supporting

confidence: 54%

A highly sensitive fluorescence probe for on-site detection of nerve agent mimic diethylchlorophosphonate DCP

Chen,

Zhang,

et al. 2024

Anal. Methods

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Section: Rational Design and Modulation Of Uorescence Probes For Sen...supporting

confidence: 54%

A highly sensitive fluorescence probe for on-site detection of nerve agent mimic diethylchlorophosphonate DCP

Chen,

Zhang,

et al. 2024

Anal. Methods

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“…Previous studies have shown that the fluorescence intensity is linearly proportional to the concentration of the target species in the low concentration range, but the fluorescence internal filtration effect produced by high concentrations of algae will distort this linear relationship [31]. Hence, linear regression models are only applicable in the low concentration range, and nonlinear regression models are required for algal concentration prediction.…”

Section: Introductionmentioning

confidence: 99%

The rapid detection method of brown tide algae concentration based on unthresholded recurrence plots and improved broad learning system

Chen,

Dong,

et al. 2024

Meas. Sci. Technol.

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In recent years, there have been frequent outbreaks of harmful algal blooms (HAB) in coastal areas, which have caused serious economic losses to the local community. Therefore, accurate and rapid prediction of microalgal concentrations is necessary for early warning and countermeasures before the occurrence of HAB. This paper presents a model for predicting microalgae concentration based on unthresholded recurrence plots (UTRPs) combined with an improved broad learning system (BLS). Spectral data acquisition of algae species at different concentrations using l-induced fluorescence spectroscopy. Then, the 1D spectral data are dimensionally lifted by UTRPs transformation, recurrence plots (RPs) transformation can fully extract the internal information of 1D sequence data, and at the same time, UTRPs avoids the influence of artificially selected thresholds on the feature transformation results of traditional (RPs). Finally, a lightweight flat network BLS was used for microalgae concentration regression prediction, at the same time the BLS regularization method was improved. When comparing the two most commonly used deep learning regression models and integrated learning models, UTRPs and elastic net (UTRPs-ENBLS) achieves convincing results.

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“…In this framework, fluorescence spectroscopy-based detection of PA has become one of the most acceptable and reliable techniques compared to the other conventional ones (e.g., gas chromatography and ion-mobility spectrometer) because of its good sensitivity, time efficiency, and technical simplicity . In recent years, carbon dots (CDs), a quasi-0D carbon-based nanomaterial with a size below 20 nm, have garnered enormous popularity as a versatile fluorescent probe in place of the conventionally used organic dyes, conjugated polymers, metal organic frameworks, quantum dots, ,− and so forth, ascribable to their tunable photoluminescence property, non-toxic nature, aqueous solubility, abundance of surface functional groups, high stability, good photo stability, and electron mobility. ,− …”

Section: Introductionmentioning

confidence: 99%

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Mahto

Samanta

Shaw

et al. 2023

ACS Appl. Nano Mater.

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We report a molecular fluorophore-based concept for the first time, to explain the quenching mechanism of the blue-emissive N-doped carbon dots (NCDs) exhibiting molecular fluorescence (quantum yield = 37%), synthesized through microwave-assisted pyrolysis of malic acid and urea (in 1:3 mole ratio), which has been devised as a fluorescent probe for the sensitive and selective detection of picric acid (PA). A linear Stern–Volmer plot for the fluorescence quenching of NCDs in the PA detection has been observed in the concentration range of 0–1.6 μM, and the limit of detection (LOD) is found to be 33 nM (7.56 ppb). Furthermore, molecular fluorescence in NCDs has been realized to originate from a putative pyridinic (2-pyridone moiety)-type molecular fluorophore, which has been manifested by the inferences drawn from HRMS, 1H NMR, 13C NMR, and XPS studies. The chemical structure of the molecular fluorophore was further validated by correlating the simulated absorption and emission spectra of the molecular fluorophore generated by TD-DFT, with those obtained from NCDs’ experimental data. The underlying photophysical property involved in the simultaneous occurrence of FRET and ET quenching mechanism has been illustrated based on the molecular fluorophore, along with the conventional approach. Here, the role of the molecular fluorophore in the NCDs has been demonstrated as a donor in the ET process involving the NCDs–nitroaromatics pair, where the acid–base interaction between the acceptor (nitroaromatics) and donor has been considered as the essence of the ET process.

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Pyridinic-N-rich carbon dots in IFE-based Turn-off Fluorometric detection of nerve agent Mimic– Diethyl chlorophosphate and multicolor cell imaging

Cited by 21 publications

References 56 publications

A highly sensitive fluorescence probe for on-site detection of nerve agent mimic diethylchlorophosphonate DCP

A highly sensitive fluorescence probe for on-site detection of nerve agent mimic diethylchlorophosphonate DCP

The rapid detection method of brown tide algae concentration based on unthresholded recurrence plots and improved broad learning system

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

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